New Rolling Technology Development of Pipeline Steel in Russia
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An effective rolling method to reduce surface defects of pipeline steel strip in 2 000 mm rolling mill was developed,which was made by Russian Magnitogorsk Iron Steel Co.,Ltd.,and local scitific research institutes.It put forward to decrease the reduction ratio by 3% to 5% in the first three rough rolling mill stand.The results showed that this method can form a good rolling condition,thus reduce the probability of defects.The probability of crack in thick plate rolling was also studied;it suggested the finishing pass should be 5 when the strip thickness is more than 16 mm.